add listIndexes and test

mongomock_motor/__init__.py

@@ -174,6 +174,9 @@ def find(self, *args, **kwargs) -> AsyncCursor:
     def aggregate(self, *args, **kwargs) -> AsyncLatentCommandCursor:
         return AsyncLatentCommandCursor(self.__collection.aggregate(*args, **kwargs))
 
+    def list_indexes(self, *args, **kwargs) -> AsyncCursor:
+        return AsyncCursor(self.__collection.list_indexes(*args, **kwargs))
+
 
 @masquerade_class('motor.motor_asyncio.AsyncIOMotorDatabase')
 @with_async_methods('__database', [

tests/test_async_cursor.py

@@ -108,3 +108,22 @@ async def test_async_for():
 
     # Check docs are correct
     assert docs == sample_docs
+
+
+@pytest.mark.anyio
+async def test_list_indexes():
+    collection = AsyncMongoMockClient()['tests']['test']
+
+    # Insert sample documents into database
+    await collection.insert_many([{'i': i} for i in range(EXPECTED_DOCUMENTS_COUNT)])
+
+    # Check that there is one default '_id' index
+    indexes = await collection.list_indexes().to_list()
+    assert len(indexes) == 1
+
+    # Create a second index on the field 'i'
+    await collection.create_index([('i', pymongo.DESCENDING)])
+
+    # Check that there are now two indexes
+    indexes = await collection.list_indexes().to_list()
+    assert len(indexes) == 2